Now that Prime Hospitality Group’s Upper West Side Japanese steak house Prime Ko is primed for summer with its outdoor patio, PHG is gearing up plans for the Upper East Side.

The group, which also owns Prime Grill and Solo, has signed a lease to open an ambitious kosher bakery and butchery. The location will be about 2,500 square feet, plus a basement, on Second Avenue between 81st and 82nd streets.

“Right now there is no full-time kosher bakery in Manhattan. It’s a niche market,” said Steven Traube, the company’s director of operations.

He added that although PHG is known for its meats, they are also going to expand and come up with their own branded line from prepared foods to sauces and frozen travel meals.

They will start with their own barbecue sauce. Soup and veal stocks are next on the menu.

“It won’t be one-stop shopping, like a supermarket, but we hope to have a lot of products,” said Marissa Rosenberg, PHG’s marketing director.

The butcher/bakery shop — which does not yet have a name — will also carry a line of frozen food based on some of its restaurant specialties, like vegetarian and duck spring rolls, dumplings, and Moroccan specialties, Rosenberg said.

They are also considering putting in some seating — a counter and some tables in the bakery, and some tables by the meats displayed in the butchery, so patrons can nosh on the gourmet-style brisket and other meat sandwiches they order from the counter.